Quote fromThank you for drawing my attention to the "The Basics" section. Your 2 and 3 are obviously incorrect: Indeed, the fact me and others like Kenny are encountering this problem attests to the fact 2 is incorrect. Also (though I think you already know this) portals are only spawned in the opposite dimension on using a portal, not when lighting them. You should probably update the original post to reflect this.
Quote fromHis 2 surface portals are within 100 blocks of each other and his new nether portal will have to be built manually.
I think you meant to say Nether portals here, that makes more sense. And it's true. I'm guessing the search range is currently 128 (closest power of 2 to the testing results), and 128 * 8 = 1024 which is why you have to walk an absurdly large distance to have the game auto-spawn a portal correctly (Going Earth to Nether).
The portal search in the nether needs to be 1/8 the search range on the overworld to account for the compression ratio (eg only searches nearest 16 blocks in the Nether, the way it was originally before the first patch). I have put this up on the bug tracker site, but it sadly seems to be being ignored... =(
I'll remove the word activate from my 2 and 3. It was intended to imply stepping into the portal, but "use" is good enough by itself.
And i agree that the surface-to-Nether search needs to be 1/8th of the nether-to-surface search to help resolve the minimal distance issue.